用it作形式主语的that-从句有以下四种不同的搭配关系:
a. It + be +形容词+ that-从句
It is necessary that 有必要
It is important that 重要的是
It is obvious that 很明显
b. It + be + -ed 分词+ that-从句
It is believed that 人们相信
It is known to all that 从所周知
It has been decided that 已决定
c. It + be +名词+ that-从句
It is common knowledge that 是常识
It is a surprise that 令人惊奇的是
It is a fact that 事实是
d. It +不及物动词+ that-分句
It appears that 似乎
It happens that 碰巧
It occurred to me that 我突然想起
17.3 名词性wh-从句
1)由wh-词引导的名词从句叫做名词性wh-从句。Wh-词包括who, whom,. whose, whoever, what, whatever, which, whichever等连接代词和where, when, how, why等连接副词。Wh-从句的语法功能除了和that-从句一样外,还可充当介词宾语、宾语补语和间接宾语等。例如:
主语: How the book will sell depends on its author. 书销售如何取决于作者本人。
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